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Draw and explain common source FET amplifier. Using small signal equivalent
circuit, derive the expression for input impedance, output impedance and
voltage gain.
PART C
Answer any two full questions, each carries 10 marks.
Draw the circuit diagram of a RC coupled amplifier. Explain the frequency

response curve of RC coupled amplifier. Why does the gain fall off at low and

high frequencies?

Prove that maximum efficiency of class B power amplifier is 78.5%.
What is the role of coupling elements in multistage amplifiers? Compare
different types of couplings used in multistage amplifier.

Explain the following terms regarding an op-amp

(1) CMRR, (ii) Slew rate
With neat diagram, explain the working of Hartley oscillator. Derive the
expression for frequency of oscillation.
PART 0

Answer any two full questions, each carries 10 marks.
Explain how op-amp can be used as a differentiator.

Design a Schmitt trigger circuit with LTP= -5V and UTP= +5V. Explain its
operation.

With the help of internal functional diagram, explain the working of astable
multivibrator using 555 timer.

Explain how logarithmic amplifier is realized using op-amp.

Design a Wein bridge oscillator using opamp to have an output frequency of

3.5kHz.

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